SparkFun Electronics Commentsurn:uuid:214d0e4e-f1b1-d287-ce26-ac5b4c9f82492015-08-02T16:33:00-06:00SparkFun ElectronicsCustomer #581590 on COM-00107 - Voltage Regulator - 5VCustomer #581590urn:uuid:9ae149de-c076-6c50-08c7-8fd2ec82dff62015-02-17T15:44:47-07:00<p>Hello, I Have A Question. I Am Making A Littlebits Module for the Bitlab, Would This Work With The RadioShack® 0.5W Solar Panel 6V To Create A Solar Module.</p>Customer #625649 on COM-00107 - Voltage Regulator - 5VCustomer #625649urn:uuid:b7c4a2f6-3967-1e21-d8df-d0edb4fc4abd2014-12-06T12:01:16-07:00<p>thnx!</p>Kamiquasi on COM-00107 - Voltage Regulator - 5VKamiquasiurn:uuid:cccc27c9-94b0-5010-9d5e-16b75bdb46cc2014-12-06T06:57:19-07:00<p>This would be &ldquo;78XXL&rdquo; :) (there&rsquo;s one in SparkFun-PowerIC.lbr and one in the standard v-reg.lbr library)</p>Customer #625649 on COM-00107 - Voltage Regulator - 5VCustomer #625649urn:uuid:89d96c66-26e3-dce0-f3ee-51efc52f21e62014-12-05T20:45:07-07:00<p>Umm which one is this exactly in the Eagle library?
Thanks!</p>Scrubb on COM-00107 - Voltage Regulator - 5VScrubburn:uuid:98b15bb9-542b-485c-9f4a-64859884ff352014-08-10T14:05:46-06:00<p>Really odd, I can barely get 0.5A through this thing. I have a motor that runs on 5V .5 amps directly from my desktop switching power supply just fine. I put this regulator in the way, crank the supply up to 9V and now the motor can only run in fits and starts if at all off the 5V regulated power. The regulator does not get to hot to touch but never seems to demand much more the .03A from the power supply. Is the datasheet correct on this?</p>jcholton on COM-00107 - Voltage Regulator - 5Vjcholtonurn:uuid:391be675-19a9-07e0-f2d4-d053116fb7392014-06-19T14:20:15-06:00<p>These regulators make excellent heaters when used with reverse polarity. I used one with an Arduino and a thermistor to regulate the temperature of a jar of brine shrimp.</p>sridenour on COM-00107 - Voltage Regulator - 5Vsridenoururn:uuid:1726580c-7654-f330-7c85-31c95a804ebc2014-02-18T13:03:35-07:00<p>The data sheet doesn&rsquo;t quite match the item. For the most part they are the same, but the data sheet says it can handle up to 1.5 amps, whereas the actual 7805 SparkFun is selling burns up well before that. The data sheet is from Texas Instruments, but the product in the photo is made by ST Micro.</p>
<p>My project is drawing 300-400mA, and this ST-made 7805 is nearly too hot to touch (I measured it at over 45 degrees C), but when powering it using a 7805 made by TI (probably the same one in the data sheet) it barely got warm. Probably has a lot to do with the TI-made 7805 having a much beefier heatsink.</p>Customer #519063 on COM-00107 - Voltage Regulator - 5VCustomer #519063urn:uuid:ff54c83e-cc08-3ae8-1bdd-892810b6d8b32014-02-10T03:03:58-07:00<p>He&rsquo;s not saying it won&rsquo;t run ABOVE 7 volts, he&rsquo;s saying it won&rsquo;t run BELOW it, and he&rsquo;s right; the datasheet specifies that this regulator has a 2V dropout, meaning that once your 9V battery drops to 7V, you won&rsquo;t be able to use this regulator anymore.</p>Jaymac on COM-00107 - Voltage Regulator - 5VJaymacurn:uuid:b2f2d72a-b090-0629-3c2f-4dadc426f2ca2014-02-01T07:51:06-07:00<p>Definitely works above 7 volts, the data sheet specifies it will regulate up to 25V in. I have run a PIC18F452 with no heat at all from 9V in</p>Tozian on COM-00107 - Voltage Regulator - 5VTozianurn:uuid:fe40f2e4-b0eb-cf8c-8138-1700a87094752014-01-30T11:44:50-07:00<p>That is not true. This works with a brand new 9V battery. Doesn&rsquo;t even get that hot.</p>Tozian on COM-00107 - Voltage Regulator - 5VTozianurn:uuid:2f9a8762-5c22-5be8-dd7e-51f5169daec22014-01-29T18:33:36-07:00<p>And as a lame pun. I have been forced to take a bite of humble pi. And a datasheet.</p>Tozian on COM-00107 - Voltage Regulator - 5VTozianurn:uuid:8b395f73-e35d-cf80-0799-5235f233ac072014-01-29T18:31:34-07:00<p>Warning:
Do not use these with your Humble Pi! The polarity is way off!</p>
<p>^ If I had know that I wouldn&rsquo;t be soaking my finger in ice water. But here I am.</p>Customer #481526 on COM-00107 - Voltage Regulator - 5VCustomer #481526urn:uuid:e5131a46-5378-395b-5960-150e1d26f2c82013-10-23T12:21:34-06:00<p><a href="http://www.csemag.com/single-article/transformer-efficiency-yesterdays-news-tomorrows-concerns/478c06eebfe849e4db9cbec2f3969fe7.html" rel="nofollow" >Above 97%</a> for higher voltage transformers seems pretty good to me.</p>Kamiquasi on COM-00107 - Voltage Regulator - 5VKamiquasiurn:uuid:80873adf-87bb-e391-2262-9ecdaa86ae6e2013-07-11T08:42:38-06:00<p>Sorry, didn&rsquo;t catch the reply notification on this one. I&rsquo;m afraid I don&rsquo;t have nearly enough experience to know whether it would interfere with equipment on 315MHz - that would largely depend on the switching frequency, how sensitive the equipment is on harmonics, and of course the actual design of the device incorporating the switching regulator.</p>
<p>I don&rsquo;t think the Mega is supposed to get warm, but it should be fine with the 5V; double-check the datasheet for the acceptable input voltage range and what that might affect, though :)</p>MikeGrusin on COM-00107 - Voltage Regulator - 5VMikeGrusinurn:uuid:5aff72f1-f5fb-183a-b9a0-99d4840cc6772013-07-01T11:49:37-06:00<p>No, a voltage divider on the input will not work. And a series resistor on the input will dissipate some of the heat itself, but isn&rsquo;t recommended if you can avoid it. Best practices with these are: use an input voltage as low as possible (but not lower than Vout + 1.5V); use a heat sink (these will only reach full current output with a heat sink); and use a switching regulator if the situation calls for it.</p>Revilo on COM-00107 - Voltage Regulator - 5VRevilourn:uuid:c1b7e907-f2da-e6e0-b294-b26ac34e382f2013-06-30T15:03:15-06:00<p>O.K. Thanks for the info! I&rsquo;ll see if I can get a series resistor to work and I&rsquo;ll order a couple switching regulators (for the future and whatnot). As far as my set up goes: I have a breadboarded ATmega328p, with a (https://www.sparkfun.com/products/10533) receiving RF, they are currently both on the 5v reg power. You said that a switching regulator causes a little RF noise, do you think it would be enough to cause an interference at 315MHz? As far as dropping the input voltage, I have tried using a 5v 1A power supply (I think this was it: https://www.sparkfun.com/products/8269) and removing the regulator, but then the Mega gets warm (Checking for shorts =P). Also I am worried that the ATmega won&rsquo;t like the 5v directly from the power supply (would powering it directly like that be fine?). Once again, thanks a bunch for the help!</p>Kamiquasi on COM-00107 - Voltage Regulator - 5VKamiquasiurn:uuid:51d87750-2c4e-abc1-3b47-78434425373f2013-06-30T06:00:40-06:00<p>Yes and no. You would be lowering the heat the regulator gives off, but now you&rsquo;re adding heat being radiated out by the resistor(s) even less efficiently. A series resistor (depending on application, would be fairly high wattage) would be more efficient, but will still be getting hot. The packages for these resistors can dissipate that heat more easily, though (hint: they&rsquo;re physically big), to the point of being able to used without a heatsink at all. They&rsquo;re available fairly cheaply, but the down side is the extra space required and that you&rsquo;re still wasting energy.</p>
<p>If heat is a concern and you can&rsquo;t implement a lower voltage input to begin with (what is your use case?), you could try designing a circuit using a switching regulator. There are drop-in replacements for the LM7805. They are a fair bit more expensive, and can be RF-noisy, but as long as that&rsquo;s not an issue or can be designed around, they may be an appropriate replacement as they are vastly more efficient, meaning they waste a lot less energy as heat.</p>Revilo on COM-00107 - Voltage Regulator - 5VRevilourn:uuid:4e73facc-812d-8ed9-b16c-414505fc61e12013-06-30T05:23:07-06:00<p>This is prob a noobish question but&hellip; If I wanted to lower the amount of heat this thing puts off, could I lower the input voltage with a voltage divider? And is this a smart idea? -Thanks in advance!</p>Customer #255632 on COM-00107 - Voltage Regulator - 5VCustomer #255632urn:uuid:2cb3c1c8-fdd1-6f7c-2eb4-8f577f0916512013-06-15T00:47:40-06:00<p>Hmmm, I thought differently before and I don&rsquo;t know why&hellip; Thanks for the clarification!</p>MikeGrusin on COM-00107 - Voltage Regulator - 5VMikeGrusinurn:uuid:2cd2dda6-aec3-059e-a9ff-9308f9582ef92013-06-15T00:32:38-06:00<p>Transformers are also considerably less than 100% efficient.</p>Customer #255632 on COM-00107 - Voltage Regulator - 5VCustomer #255632urn:uuid:7b5373d5-a9ad-0bd7-a555-7b052f39d4ce2013-06-15T00:24:57-06:00<p>I was saying that just as a comparison of efficiency, not that a transformer could ever replace switching or linear regulators in a DC circuit.</p>MikeGrusin on COM-00107 - Voltage Regulator - 5VMikeGrusinurn:uuid:34c2346e-214c-dd9a-466e-780c0fee3c132013-06-14T19:58:31-06:00<p>A transformer is 0% efficient with DC.</p>Customer #255632 on COM-00107 - Voltage Regulator - 5VCustomer #255632urn:uuid:87a35374-9a3e-d85b-7dd8-15c185bcbe722013-06-13T22:02:46-06:00<p>91% efficiency?! OH MY GOODNESS! That&rsquo;s almost as efficient as a transformer!</p>MikeGrusin on COM-00107 - Voltage Regulator - 5VMikeGrusinurn:uuid:2c243fe1-94a7-f658-0877-82193cfcaecc2013-04-10T11:07:13-06:00<p>The quick answer is that you can try, however slight manufacturing differences will typically mean that one device will try to handle most of the load, shut down, with the same thing happening to the rest in sequence. Google &ldquo;parallel voltage regulators&rdquo; for more information.</p>
<p>But, you should be able to find or make a 5V 10A voltage regulator for much less than $50, especially if it can be a nonisolated switching DC-DC type rather than a linear regulator.</p>jokerley on COM-00107 - Voltage Regulator - 5Vjokerleyurn:uuid:2d319bcf-7cb8-c80b-02f3-0c843d21c56b2013-04-10T08:40:18-06:00<p>This may be a little out there, but can run these in parallel to up the amperage? If put 10 of these with the proper decoupling caps in parallel, could I theoretically run something at 10 amps? The main reason I ask is that 10A VR&rsquo;s can run between $50-$100 and I figure this can be a cheap alternative for some basic regulation on my solar setup.</p>Akatm7 on COM-00107 - Voltage Regulator - 5VAkatm7urn:uuid:4a916607-b0f0-c753-5adf-333d84c35a4b2012-10-25T18:34:59-06:00<p>:()
AWESOMENESS</p>LineKernel on COM-00107 - Voltage Regulator - 5VLineKernelurn:uuid:97f83659-4dbc-f510-d6ec-52eb49ad09422012-09-08T19:39:46-06:00<p>nice ! thank you .</p>ATtiny Fan on COM-00107 - Voltage Regulator - 5VATtiny Fanurn:uuid:8c060b91-6a9e-4d82-b88d-9becb2eef17a2012-07-10T20:43:20-06:00<p>Then you easily be able to use this regulator.</p>bgsteiner on COM-00107 - Voltage Regulator - 5Vbgsteinerurn:uuid:1345bd7e-87f2-0d81-8882-afa70874cd3e2012-07-02T09:35:34-06:00<p>I&rsquo;m trying to get a stable 5v output from a 600mA 12V wall plug that also runs a small amp for a portable stereo I&rsquo;m building eventually I will upgrade to a 2A supply what would you reccomend.</p>LineKernel on COM-00107 - Voltage Regulator - 5VLineKernelurn:uuid:eb27e46d-c333-7e17-140c-661040d651932012-06-26T17:02:59-06:00<p>heu.. i guess not much , i just use it to read a analog pin , and set a Hight or Low pin to drive this guy http://www.sparkfun.com/products/10256
i hope i am doing it right</p>SuperCrackMunkey on COM-00107 - Voltage Regulator - 5VSuperCrackMunkeyurn:uuid:9e722ba3-18d4-53b7-1ee7-f0ac3faef5fb2012-06-05T17:40:36-06:00<p>These would be a nice addition to the products here&hellip; hint hint&hellip; (they are kinda of expensive but not too bad for a drop in replacement)</p>Customer #84737 on COM-00107 - Voltage Regulator - 5VCustomer #84737urn:uuid:466e26f4-93a8-7d35-7278-1a9b7d1917822012-05-09T08:20:13-06:00<p>I was on Digikey and found this awesome replacement: <a href="http://www.digikey.com/product-highlights/us/en/cui-v78-regulators/1177" rel="nofollow" >V78xx Switching Regulators</a></p>ATtiny Fan on COM-00107 - Voltage Regulator - 5VATtiny Fanurn:uuid:b9b59a5c-71ff-de67-91f2-af86a50d84a42012-04-26T08:21:04-06:00<p>Using between 1-10uF is common. As for the heat, you may have to use a heatsink being that it is using a 12V source. What kind of current draw will your ATtiny setup use?</p>ATtiny Fan on COM-00107 - Voltage Regulator - 5VATtiny Fanurn:uuid:38c27fdb-26d2-3b4d-8dd4-da356d445cbb2012-04-26T08:16:09-06:00<p>I use a standard circuit which has the 7805, a 10uF on Input and 1uF on output. Most of these different capacitor setups will work most of the time.</p>LineKernel on COM-00107 - Voltage Regulator - 5VLineKernelurn:uuid:d46fef46-2fb9-b47f-38ca-dcede9dd9eb82012-03-25T14:44:43-06:00<p>how can i calculate the capacitor needed in my system ?
i want to power a attinny from a 12v 2A led strip power supply , and use the attinny as the controler for the strip .
is the capacitor value really important ? or anything between 0.1 to 10 uF will do ?</p>
<p>will it be really hot , heat wise ?
should i use another regulator ?</p>Customer #133003 on COM-00107 - Voltage Regulator - 5VCustomer #133003urn:uuid:a71ffe76-0dad-b22f-e5cf-186d8a0d1fdc2011-12-28T19:09:05-07:00<p>You should keep in mind that the quiescent current on this is very high at around 5-10mAh depending on input voltage. I found out the hard way that it chews through batteries.</p>Customer #129214 on COM-00107 - Voltage Regulator - 5VCustomer #129214urn:uuid:96062c12-a129-9153-127f-25a25f5e762c2011-11-11T08:40:52-07:00<p>I&rsquo;m driving one with a 16V supply. I drilled a hole in a quarter and bolted it to the 7805, and it&rsquo;s been stable for at least 2 weeks.</p>Customer #249872 on COM-00107 - Voltage Regulator - 5VCustomer #249872urn:uuid:cf95937f-e3f2-6bd1-4c2a-7ceb845fb7f82011-09-07T22:39:29-06:00<p>So can I use this if I have an 12v analog signal? I want to connect it to IOIO for android DEV-10748.</p>sethborders on COM-00107 - Voltage Regulator - 5Vsethbordersurn:uuid:347da803-721a-7159-c34f-81fc0f4445552011-07-19T11:15:29-06:00<p>I&rsquo;m speculating here, but I think the best capacitance depends on how much current you need to supply. If your capacitance is too low compared to your current, then your supply wont be stable, but if the capacitance is too high compared to your current, then you wont be able to charge the caps up to the right voltage.</p>Customer #184519 on COM-00107 - Voltage Regulator - 5VCustomer #184519urn:uuid:54d2876b-17b8-ef71-7e1a-aeb62ec6857a2011-06-12T07:43:56-06:00<p>Which caps should I use with this regulator? If I want a realy stable supply?<br/>
In the data scheet they use a 0.33 uF and 0.1 uF.<br/>
And here http://www.arduino.cc/en/Main/Standalone are they useing 2 10 uF capacitors.</p>Customer #98770 on COM-00107 - Voltage Regulator - 5VCustomer #98770urn:uuid:8c2056de-1aeb-6392-b266-03634582d3932011-02-13T05:01:03-07:00<p>WARNING: Be sure to have correct polarity on this, otherwise it will get extremly hot very quickly. Melted my wires :).</p>razor_sparks on COM-00107 - Voltage Regulator - 5Vrazor_sparksurn:uuid:faf9d208-7b94-e9ea-38da-4e105c8144bf2011-02-03T08:25:15-07:00<p>Yes. LN2 counts as wacky 80% of the time :)</p>Sacman on COM-00107 - Voltage Regulator - 5VSacmanurn:uuid:f037ab6c-7113-0b3c-bac1-4ae27da73ff62011-01-26T01:11:17-07:00<p>I just found out that these Regulators will stop regulating somewhere between 7v and 7.5v. Trying to use a 9v battery with one of these is a mistake. I found this out the hard way driving a Pic and a 4D 1.44 ulCD display (these displays rock!). I have spent the last day trying to figure out why everything went wonky on me until I read about this.<br/>
What I have gathered is I need a low drop out (LDO) regulator to make this work. DigiKey has an LP2989IM-5.0-ND which supplies 5V/500mA with a drop out of .31v which allows for a lot better utilization of the 9V battery. I may eventually go with a LiPO option but the 9V fits my project well. The Display draws a maximum of 180mA and most of my display is black so it should be well less than the max. With a 9v supplying about 500mAh, I would be content to get about 3 hours of solid uptime with the PIC taking up essentially none.<br/>
Hope this helps someone in the future.</p>Electrical Juggernaut on COM-00107 - Voltage Regulator - 5VElectrical Juggernauturn:uuid:10600972-cda4-e662-c7fd-6a460790b18b2011-01-20T16:44:04-07:00<p>On a recent project, I had mine cooled to -85°C with LN2, had about 8 to 10 watts and it worked fine ;) Does that qualify as wacky cooling?</p>SiliconValet on COM-00107 - Voltage Regulator - 5VSiliconValeturn:uuid:9a9f344c-5dd4-73de-f85e-42b04ac092232010-05-01T17:32:17-06:00<p>AFAIK The difference in power entering and leaving these things is dissipated as heat. Most of these things can only dissipate so much (7805A maxes out at 2.7W) Which means that although you can feed them 25V, you limit the current you can pass through unless you&rsquo;ve got some wacky cooling.</p>PresidentOfAwesomeness on COM-00107 - Voltage Regulator - 5VPresidentOfAwesomenessurn:uuid:16f6ee9c-55f8-3d1f-25dd-2371f9aff0a22010-02-10T16:14:12-07:00<p>The minimum supply voltage is 7 volts, and the maximum is 25 volts. It says so in the datasheet. From experience I know that the performance will be eractic when supplying it lower than 7 volts.</p>JLC on COM-00107 - Voltage Regulator - 5VJLCurn:uuid:73dcbcdd-4a68-94de-e091-10cf2b17994f2010-01-19T00:54:07-07:00<p>Tried supplying it with 4 AA batteries (6v) but it will not output 5v then. So if you plan power your project with batteries using this then go for 9v. Or just drop the regulator and use the &ldquo;NCP1400-5V Step-Up&rdquo;.</p>